Once she starts laying she will decrease the amount of times she assumes the position. When she goes broody she will stop completely. Toms should not be allowed access to the nest. They will take the hen sitting on the nest as an invitation to breed. At the least eggs will get broken. At the worst the hen will get cut badly or even killed.I might do that because it's just the one hen that gets bred, none of the other ones have been messed with. The hen goes into the breeding posture for him though, will she eventually get sick of it and stop doing that.